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CVE-2026-89965

nvdimm/btt: reject an arena whose nfree is below the lane count

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: reject an arena whose nfree is below the lane count The BTT info block's nfree field, the number of reserve free blocks, is read from the medium without validation. btt_freelist_init() and btt_rtt_init() size the per-lane freelist[] and rtt[] arrays by nfree, but the I/O path indexes them by the lane from nd_region_acquire_lane(), which is bounded by nd_region->num_lanes (ND_MAX_LANES), not by nfree. A crafted or foreign arena whose nfree is below the lane count makes freelist[lane]/rtt[lane] run past the allocation: an out-of-bounds write. btt.rst documents the nlanes = min(nfree, num_cpus) invariant, which the code does not currently honor: num_lanes is ND_MAX_LANES regardless of nfree. Reject an arena whose nfree is below num_lanes at discovery, before the per-lane arrays are allocated, enforcing that invariant.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 5212e11fde4d40fa627668b4f2222d20db488f71 · fixed in eb491343d2d1784121ad9af91c25b338c28913c3; From 5212e11fde4d40fa627668b4f2222d20db488f71 · fixed in 59d5cd1f42b4bab3609512c3cb3d3540d3d21da7; From 5212e11fde4d40fa627668b4f2222d20db488f71 · fixed in f6c5313aae794ecca8f762c1a3493de5c266f120; From 5212e11fde4d40fa627668b4f2222d20db488f71 · fixed in f9bf05c63b77d000e9c01f3e47af36973887d350; From 5212e11fde4d40fa627668b4f2222d20db488f71 · fixed in 6f79d1a5f2611a3d36e9312be5425cd9cb397c51; From 5212e11fde4d40fa627668b4f2222d20db488f71 · fixed in 6b1faf1f099f7060b5f1f2f0d024132581f1726e; From 5212e11fde4d40fa627668b4f2222d20db488f71 · fixed in 9dfa11cef4750b67591307f2c62e47a23d60e4b7; From 5212e11fde4d40fa627668b4f2222d20db488f71 · fixed in 6a1f2e5ed9267ca19187038ac635393c165213ac

  • Linux Linux

    4.2

  • KernelLinux

    From 4.2.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.51; From 6.19.0 · fixed in 7.2.5

References 8

git.kernel.org